$0

50000 Income

-3700X4=14800 Exemptions

-11600 standard deduction

-6000 Child and Dependent Care Expenses

-3000 medical/dental insurance

=14600

By tax table, you have to pay tax $1761.

But you have child tax credit =$1000x2=$2000.

1761-2000= -239 You don't need to pay any tax. Instead of paying tax, you
should apply for government benefit, such as food stamp.